\begin{tikzpicture}
	\pgfmathsetmacro{\r}{1.5}
	\pgfmathsetmacro{\R}{1.5}
	\pgfmathsetmacro{\a}{120}
	\pgfmathsetmacro{\b}{60}

	\begin{scope} [xshift=-1cm]
		\tkzDefPoints{0/0/B, \r/0/A}
		\tkzDefPoint(\a:\r){C}
		\tkzDrawSegments(B,A  B,C)
		\tkzMarkAngle[size=0.5](A,B,C)
		\tkzLabelAngle[pos=0.8](A,B,C){$3$}
	\end{scope}

	\begin{scope} [xshift=1cm]
		\tkzDefPoints{0/0/B, \r/0/A}
		\tkzDefPoint(\b:\r){C}
		\tkzDrawSegments(B,A  B,C)
		\tkzMarkAngle[size=0.5](A,B,C)
		\tkzLabelAngle[pos=0.8](A,B,C){$4$}
	\end{scope}

	\begin{scope} [yshift=-2cm]
		\tkzDefPoints{0/0/B, \R/0/A}
		\tkzDefPoint(\b:\R){C}
		\tkzDefPoint(\a+\b:\R){D}
		\tkzDrawSegments(B,A  B,C B,D)
		\tkzMarkAngle[size=0.5](A,B,C)
		\tkzLabelAngle[pos=0.8](A,B,C){$4$}
		\tkzMarkAngle[size=0.6](C,B,D)
		\tkzLabelAngle[pos=0.9](C,B,D){$3$}
	\end{scope}
\end{tikzpicture}

